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(In)Stabilities and Complementarity in AdS/CFT

Strings 2012 Munich July. (In)Stabilities and Complementarity in AdS/CFT. Eliezer Rabinovici The Hebrew University, Jerusalem Based on works with J.L.F Barbon Based on work with R. Auzzi, S. Elitzur and S.B. Gudnason.

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(In)Stabilities and Complementarity in AdS/CFT

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  1. Strings 2012 Munich July (In)Stabilities and Complementarity in AdS/CFT Eliezer Rabinovici The Hebrew University, Jerusalem Based on works with J.L.F Barbon Based on work with R. Auzzi, S. Elitzur and S.B. Gudnason

  2. J. L. F. Barbon and E. Rabinovici, “AdS Crunches, CFT Falls And Cosmological Complementarity,”JHEP 1104, 044 (2011) [arXiv:1102.3015 [hep-th]]. • J. L. F. Barbon and E. Rabinovici, “Holography of AdS vacuum bubbles,”JHEP 1004, 123 (2010) [arXiv:1003.4966 [hep-th]]. • J. L .F. Barbon and E. Rabinovici, work in progress. • R. Auzzi, S. Elitzur, S. B. Gudnason and E. Rabinovici, “Time-dependent stabilization in AdS/CFT,”Accepted for publication in JHEP [arXiv:1206.2902 [hep-th]].

  3. References • S. R. Coleman , F. De Luccia • T. Banks • T. Hertog , G. T. Horowitz, B. Craps, N. Turok, A. Bernamonti • S. Elitzur, A. Giveon, M. Porrati , E. Rabinovici • S. de Haro, I. Papadimitriou , A. C. Petkou • J. Orgera, J. Polchinski,; D. Harlow • J. Maldacena

  4. Content • Introduction • Bulk • AdS set up • Boundary • Complementarity • Butterflies

  5. Dualities • Geometry • Topology • Number of dimensions, small and large • (non-)Commutativity • Singularity structure • Associativity

  6. =

  7. Singularities express a breakdown of our knowledge/approximations • In general-covariantly invariant theories, singularities can hide behind horizons • Finite black hole entropy can be reconstructed from the outside • Can infinite entropy of a crunch be reconstructed as well?

  8. Ads set up

  9. In AdS what you see is not what you get • In AdS volume scales like • area for large enough • Area. The unstable • state can be stable or: ?

  10. Non perturbative definition of the theory. There are several possible QFT duals on the bondary boundary

  11. If the boundary theory is well defined so is the crunch in the bulk. • For the bulk crunch example above the boundary theory is well defined. Possible to describe a crunch. • It is well defined on a world volume which is dS but there is no gravitational coupling. • To see the crunch change coordinates on the boundary.

  12. In the dS frame: • The World Volume expands(consider a slow expansion relative to other scales). • Time extends from -∞ to ∞ • The couplings in the Lagrangian are time INDEPENDENT In the E frame: • The world volume is static when it exists. • Time has a finite extension. • The relevant couplings in the Lagrangian are time dependent and explode at the end of time. The marginal operators remain time independent.

  13. A simple classical model: O(N) on de Sitter Phases are clear-cut

  14. Over at the E-frame... Mass term blows to in finite time

  15. A crunch can be described by a regular QFT on dS or by evolving with a state by a Hamiltonian which is well defined for a finite time range and then ceases to exist. • The two Hamiltonians do NOT commute.

  16. One can build quantum mechanical models with two non-commuting Hamiltonians t-evolution crunches and τ-evolution is eternal but they are complementary as both time evolution operators are related by a unitary canonical map

  17. Bulk analogs bubble of nothing Continues to dS gap and E-decoupling Domain wall flow Continues to dS condensate and E-crunch

  18. What about ? This is the slightly massive UV CFT on a finite box Detailed dynamics should depend on quantum effects after large-N summation In Bulk, we get linearized scalar flows which crunch for either sign of Small scalar flow small large-N dS condensate E-frame still crunches (Maldacena)

  19. An unstable marginal operator on the boundary is related to a Coleman de Luccia bubble in the bulk.

  20. As seen on the boundary this crunch situation involves a flow to infinity at a finite time and need not be healed in the bulk.

  21. Time dependent butterfly-like boundary potential Butterflies • Stable? • What is the dual theory in the bulk?

  22. Positive effective potential for drift mode High frequencies of oscillation

  23. Free Field theory Stability zones Mathieu equation Instability zones

  24. For a < 2q instabilities are cured • For a > 2q resonances may appear • For compactified world volume resonances can be avoided (number theory results) • What about interacting boundary field theory? • It should thermalize • Go to the bulk

  25. Expectations • When the boundary theory is unstable, the bulk would crunch? • When the boundary theory is stabilized, then the bulk is healed? • An interacting boundary theory can thermalize and produce a black hole in the bulk? • Using AdS/CFT dictionary and numerical analysis

  26. AdS Crunches Crunch singularities appearing in a finite time for low frequencies

  27. Black holes Black holes appearing in a short time

  28. Black holes Black holes appearing only after a long time – Waves bouncing back and forth

  29. Conclusions • Crunches can be described by complementary non commuting Hamiltonians. With or without drama. • Time dependent boundary Hamiltonians can heal crunch singularities.

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